Billion BiPAC 7800(N)X(L) User Manual page 173

The following configuration page will appear to let you configure.
Interface: select from the drop-down menu the interface you want the virtual server(s) to apply.
Server Name: select the server name from the drop-down menu.
Custom Service: It is a kind of service to let users customize the service they want. Enter the user-
defined service name here. It is a parameter only available when users select Custom Service in
the above parameter.
Server IP Address: Enter your server IP Address here. User can select from the list box for quick
setup.
External Port
 Start: Enter a port number as the external starting number for the range you want to give
access to internal network.
 End: Enter a port number as the external ending number for the range you want to give
access to internal network.
Internal Port
 Start: Enter a port number as the internal staring number.

End: Here it will generate automatically according to the End port number of External port
and can't be modified.
Protocol: select the protocol this service used: TCP/UDP, TCP, UDP.
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